USPTO Patents Application 10783331

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IN THE CLAIMS:

The pending claims are set forth below and have been amended and/or cancelled,
without prejudice, where noted:

1- (Cancelled)

2. (Currently Amended) The method of claim 4 - 20, w herein said Ziegler-Natta
catalyst has a titanium content within the range of 1 .7-2.2 wt%,

3. (Original) The method of claim 2 wherein said Ziegler-Natta catalyst has a
titanium content of at least 1 .8 wt.%.

4. (Currently Amended) The method of claim ±20^_wherein said polymer fluff has a
melt flow rate in excess of at least 300 grams/1 Ominutes and a xylene soluble content of
no more than 3,5 wt. %.

5. (Currently Amended) The method of claim ^^wherein said supported Ziegler-
Natta catalyst comprises titanium tetrachloride on a magnesium-based support.

6. (Original) The method of claim 5 wherein said internal electron donor is di-
butylphthalate.

7. (Original) The method of claim 6 wherein said external electron donor is
cyclohexylmethyldimethoxysilane.

8- (Currently Amended) The method of claim 4 - 20, w herein said trialkyl aluminum
co-catalyst is triethyl aluminum.

9. (Original) The method of claim 8 wherein said tryethyl aluminum contains
aluminum hydride in an amount of no more than 1 wt.%.

COS-818 1st RO A Official

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10. (Currently Amended) The method of claim 4_20Jurther comprising supplying
hydrogen to said reactor in an amount of no more than 1 mole percent of the propylene
supplied to said reactor.

11. (Original) The method of claim 10 wherein said hydrogen is supplied to said
reactor in an amount within the range of 0.45-0.9 mole percent of the propylene supplied
to said reactor.

12. (Original) In a process for polymerization of propylene with a Ziegler catalyst
to provide a high melt flow index propylene polymer, the method comprising:

providing a supported catalyst component comprising a titanium tetrahalide
supported on a magnesium based support and an internal electron donor comprising a
diester of an aromatic dicarboxylic acid, said catalyst component containing titanium in
an amount within the range of 1.7-2,2 wt.%;

providing a trialkyl aluminum co-catalyst component selected from the group
consisting of trimethylaluminum and triethylaluminum;

providing an organosilyl external electron donor component;

combining said supported catalyst component, said organoaluminum co-catalyst
component and said external electron donor component in relative amounts to provide an
aluminum/silicon mol ratio within the range of 10-500 an aluminum/titanium molar ratio
within the range of 50-500 and a silicon/titanium mol ratio within the range of 1-50;

introducing said combined catalyst system into a polymerization reactor and into
a contact with propylene;

supplying hydrogen into said polymerization reactor; and

within said polymerization reactor effecting polymerization of said propylene in
the presence of said catalyst system to produce a polymer fluff having a melt flow rate of
at least 300grams/10 minutes and a xylene soluble content of no more than 4 wt%.

COS-81S 1st ROA Official
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13. (Original) The method of claim 12 wherein said Ziegler-Natta catalyst has a
titanium content of at least 1,8 wt.%.

14. (Original) The method of claim 12 further comprising supplying hydrogen to
said reactor in an amount of no more than 1 mole percent of the propylene supplied to
said reactor.

15. (Original) The method of claim 16 wherein said hydrogen is supplied to said
reactor in an amount within the range of 0.45-0.9 mole percent of the propylene supplied
to said reactor.

16. (Original) The method of claim 1 4 wherein said internal electron donor is di-
butylphthalate.

17. (Original) The method of claim 16 wherein said external electron donor is
cyclohexylmethyldimethoxysilane.

18. (Original) The method of claim 17 wherein said trialkyl aluminum contains
aluminum hydride in an amount of no more than 1 wt%,

19. (Original) The method of claim 17 wherein said polymer fluff has a xylene
soluble content of 2.8-3.5 wt.%.

Please add the following new claims:

20. (New) In the production of a stereo regular propylene po!ymer> the method
comprising;

operating a polymerization reactor under temperature and pressure conditions
effective for the reaction of propylene supplied to said reactor to produce a stereo regular
propylene polymer fluff;

supplying a monomer stream containing propylene to said reactor,

COS-8 1 8 1 st ROA Official 4

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incorporating into said monomer stream a titanium-based supported Zicgler-Natta
Catalyst having an internal electron donor and a titanium content in amount of from 1.7
wt.% to 2.2 wt %;

supplying to said propylene monomer stream a co-catalyst comprising a tri-
alkylaluminum wherein the co-catalyst is present in an amount to provide an
aluminum/titanium molar ratio within the range of 50-500;

supplying to said propylene monomer stream a silicone-based external electron
donor in an amount to provide an aluminum/silicon molar ratio within the range of 10-
500; and

recovering polymer fluff from said polymerization reactor having a melt flow rate
of at least 200 grams/10 minutes and a xylene soluble content of no more than 4 wt.%.

21. (New) In the production of a stereo regular propylene polymer, the method
comprising:

operating a polymerization reactor under temperature and pressure conditions
effective for the reaction of propylene supplied to said reactor to produce a stereo regular
propylene polymer fluff;

supplying a monomer stream containing propylene to said reactor;

incorporating into said monomer stream a titanium-based supported Ziegler-Natta
Catalyst having an internal electron donor consisting essentially of a phthalate compound
and a titanium content in amount of at least 1 .7 wt.%;

supplying to said propylene monomer stream a co-catalyst comprising a tri-
alkylaluminum wherein the co-catalyst is present in an amount to provide an
aluminum/titanium molar ratio within the range of 50-500;

supplying to said propylene monomer stream a silicone-based external electron
donor in an amount to provide an aluminum/silicon molar ratio within the range of 10-
500; and

recovering polymer fluff from said polymerization reactor having a melt flow rate
of at least 200 grams/10 minutes and a xylene soluble content of no more than 4 wt.%.

COS-818 la ROA Official 5
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